Richard Arnold Epstein (March 5, 1927 in Los Angeles, California – July 5, 2016), also known under the pseudonym E. P. Stein, was an American game theorist.
Epstein obtained his Bachelor of Arts degree from the University of California, Los Angeles, in 1948.
He received his doctorate in physics, on the Born formalization of isochromatic lines, in 1961, from the University of Barcelona.
The Theory of Gambling and Statistical Logic ranks as the most popular of Epstein's technical books.
Under the pseudonym "E. P. Stein", he authored various popular works of fiction as well as historic and non-fictional books, and writes for TV and motion pictures.